Ventilating-fan.



J. E. OSTRANDBR.

VENTILATING FAN.

APPLICATION FILED D5022, 1911.

Patented Jan. 21, 1913.

'muemtor JwPER E. USTZTANDEfi wummow 5% WM W 'the ventilating fan and afragment ofthe out weather.

Specification-bf was. ream.

a lication filed-December a2, 1911. Serial No. 669,821.

The device is particularly adapted to be conveniently used in buildingswhere, after construction, the usual ventilating system has been foundinadequate and it is desired to provide for a circulation of air, in therooms, by utilizing the air exteriorly of the room or building, suchconvenient openings asv a window, transom windowfor the, like being usedin transferring the air in continuous currents from one place toanother.

The principal object of my invention is to provide a device of thecharacter described, which, while eilicijently serving the purpose as anair circulator, retards the propagation of sound from one side of thewall to the other substantially the same as would a closed wall opening.

A further object of my invention is to render the device adjustableto'negula'te-the volume of air transferred by the device.-

In the drawings, forming a part of this specification :-'Figure 1 is an1nterior elevation of a portion of a window frame inclosing a deviceembodying my invention. Fig. 2 is a cross sectional View onsubstantially the lines 22 of Fig, 1, Fig3 is a fragmentary elevation ofa portion of wall portion. Fig. 4 is a side elevation o wall'portion itis associated wlth. In the drawings, where similar-characters.

.refer to similar parts throughout the views,

1 designates a wall portion or screen, preferably of sound proofmaterial, which may be conveniently placed within a window casing 2, thesash 3 thereof being raised to accommodate the former and bein inabutting relation thereto, to exclude inc em- The air current producingmeans includes a revoluble fan 3 provided with a lglurality of blades 4.extending crosswise t e plane of rotation thereof. The fan may berotated .by an electric motor 5, or any other desired. motion generatingmeans, the fan being mounted on the shaft 6 of the motor.

Since it is undesirable to expose a de vice, such as a motor, to theinclemency of the weather. the wall portion 1 has a slot 7 through whichthe fan 3 may revolve with its plane of rotation crosswise and diagonalwith respect to the plane of the wall portion,

the motor 5. then being supported on a bracket 8 secured to the wallportion 1 and wholly disposed on theprotected or interior side of thewall portion. By this arrangement, I avoidplacing the motor with theaxis of its drive shaft parallel and within the plane of the wallportion 1, the-center of the fan being, however, substantially in theaxis of the latter.

7 In order 'to retard the propagation of sound" from the one side of thewall to the other, I rovide a drum-like housing 9, preferably pivoted toswing about the axis of the shaft 6. These sector-like housing membersmay frictionally engage the walls of the slot 7 to retain a stationaryposition, and, as

twice the angular distance between the center lines of the blades, thatis, the angular ma nitude of each of the lateral walls of eao member 10is substantially that of the angular magnitude between the center linesof two alternate fan blades, as clearly shown in Fig. 2. In this figure,one blade is shown rammed Jan.21, i as.

ormed of sector-like portions 10 looking directly at its peripheraledge, and

wholly inclosed by the section 10, one half of each of the next adjacentblades at either side of the blade referred to is also inclosed by thesame section 10, therefore, there are two blades or their equivalentclosing the opening which is in communication with both sides of thewall 1 formed by the slot 7 to retard propagation of sound therethrough.

The operation of the device is' as follows:Upon rotation of the fan, airis indrawn from one side of the wall 1 and eitpelled at'the other sidethereof, and, similarly air is transferred in a like manner in a counterdirection. As indicated in Fig. 1, freshair is entering adjacent theupper margin of the peripheral opening of the drum-like housin 9, andfoulair finding egress adjacent t e lower margin of such draw in thecurrent, as desire bers retaining their adjusted position by. frictioncontact with the margins; of slot 7.

opening. To control the volume of air enterin and leaving the room, themembers 10 o the housing 9 may be swung on their axes and brought/neartogether, or s 'aced f 21 art from veach other asdesired, an furt er,the air expelled may be'directed to flow, as desired, b manually rnovinthe members 10 provi ing for ingress of air, and similarly, the members10 roviding for egress of air, maycbe manual moved to d the mem-Inasmuch as two or more of the blades of the fan are ever within-thehousing 9, at that portion thereof intermediate the transverse marginsof the openingstherein, when the parts are in assembled operative.relation to each other, the sounds are not readily propagated throughsuch obstructions andconsequently the intensity of the sound on one sideof a wall, is substantially no greater than would'be if openings wereentirely closed, as with a glazed sash or the like.

L'The combination with a wall ortion havin a slot, of a rotatable fan,disposedv eluding a slot, of a rotatable fan, disposed with its plane ofrotation passin the slot in the wall portion and with respect to thedrum-like housing for said fan disposed in said slot in said wallportion and having peripheral openings at both sides of the latthroughiagonally plane of the latter, a

ter, said housing being adapted to house two or more of the blades ofthe fan, at that portion of the housin intermediate the transversemargins of t e opposite peripheral opening thereof, substantially as andfor the purpose set forth, and means disposed adjacent one side of thewall portion for rotatlngsaid fan.

'3. The combination with a wall portion having a slot, of a rotatablefan, including a plurality of radially extending blades disposedcrosswise the plane of rotation thereof,..s'aid 'fan being disposed withits lane of rotation passing through the slot 1n the wall portion, and ahousing for said fan, including oppositely disposed sectorlike portionsdisposed in the said slot in said wall portion, the angular magnitude ofthe walls of said sector-like portions being substantially equal to theangular disposition of the radial axes of two alternate fan blades,substantially as and for the purpose set forth. I

4. The combination with a wall portion, having aslot, ofa rotatable fan,including a plurality of radiallyexte'nding blades disposed crosswisethe lane of rotation thereof, said fanbeing isposed with its plane ofrotation passing through the slot in the wall ortion, and a housing .forsaid fan including sector-like port-ions oppositely disposed withrespect to each other in engaging relation to the walls of the said slotin said wall portion and pivotally mounted to swing about. the axis ofrotation of said fan, the angular magnitude of the walls of saidsector-like portions bein substantially equal to the angular dispositionof the radial axes of two alternate fan blades, substantially as and forthe purpose set forth.

In testimon whereof I afiix my signature in presence 0 two witnesses.

V JASPER E. OSTRANDEB.

